正则表达式在给定单词之前和之后搜索5个单词 [英] Regex to search for 5 words before and after a given word

问题描述

我需要编写一个AS3程序，以在某些博客的rss中搜索某个关键字".

I need to write an AS3 program to search for a certain "keyword" in the rss of certain blogs.

我已经使用 String.indexOf()编写了逻辑，但这 EXTREMELY 很慢，而且不可扩展.我一直在寻找写一个正则表达式来查找关键字，但是在关键字之前和之后还返回5个单词(以显示搜索结果的上下文).

I've written logic using String.indexOf() but this is EXTREMELY slow, and not scalable. I've been looking to write a regular expression which looks for the keyword, but also returns 5 words before and after the keyword (to show the context of the search result).

我认为重叠的比赛可以忽略.

I suppose overlapping matches can be ignored.

我想出了(?:[a-zA-Z'-] + [^ a-zA-Z'-] +){0,5}关键字(?:[^ a-zA-Z'-] + [a-zA-Z'-] +){0,5}

唯一的问题是:它不查找完整单词.因此，在

The only problem with this is: It does not look for full words. So, using that regex on

那只敏捷的棕色狐狸跳过了那只懒狗，然后在狗窝里午睡了

the quick brown fox jumps over the lazy dog, and then goes for his afternoon nap in the kennel

对于关键字"the"，将匹配

for the keyword "the", would match

快速的棕色狐狸跳过
懒狗和
n去狗窝午睡

the quick brown fox jumps over
the lazy dog, and the
n goes for his afternoon nap in the kennel

注意"then"被分割.

Notice the "then" gets split.

我怎么只匹配整个单词?

How do I match the whole word only?

我尝试在关键字之前和之后添加空格和标点符号，但这会在搜索文本的绝对开头和结尾出现关键字问题.

I tried adding whitespace and punctuation before and after the keyword, but that will cause a problem for keywords in the absolute start and end of the search text.

有什么办法解决吗?

将真实世界的文字设为

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推荐答案

所以在不到一个月的常规使用时间后，我发现了

So after a little less than a month of regular use, I find that

"((?:[a-zA-Z'-]+[^a-zA-Z'-]+){0,5}\W)(" + keyword + ")(\W(?:[^a-zA-Z'-]+[a-zA-Z'-]+){0,5})"

效果最好.

我用单词边界代替了非单词字符.这样可以在关键字之前/之后立即使用标点符号.

I substituted the word boundaries for a non-word character. This allows for punctuation immediately before / after the keyword.

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